Offset mechanism for printing-machines.



N0. 787,141. PATENTED APR. 11, 1905. H. M. BARBER.

OFFSET MECHANISM FOR PRINTING MACHINES.

APPLIOATION FILED NOV. 21, 1904.

7 SHEBTSSHEBT 1.

PATENTED APR. 11, 1905.

H. M. BARBER.

OFFSET MECHANISM FOR PRINTING MACHINES.

APPLIOATION FILED NOV. 21, 1904.

7 SHEETS-SHEET 2.

5 0 9 1 1 1 R P A D E T N E m A P H. M. BARBER.

OFFSET MECHANISM FOR PRINTING MACHINES.

APPLICATION FILED NOV. 21, 1904.

7 SHEETS-SHEET 4.

No. 787,141. PATENTED APR. 11, 1905. H.- M. BARBER.

OFFSET MECHANISM FOR PRINTING MACHINES.

APPLICATION FILED NOV. 21, 1904.

7 SHEETS-$111731 5.

)"Ia'ineaa e01 7,141. PATENTED APR. 11, 1905. y H. M. BARBER. OFFSETMECHANISM FOR PRINTING MACHINES.

APPLICATION FILED NOV. 21, 1904.

'1 SHEETS-SHEET e.

PATENTED APR. 11, 1905.

H. M. BARBER. OFFSET MECHANISM FOR PRINTING MACHINES.

APPLICATION FILED NOV. 21, 1904.

7 SHEETS-SHEET '7.

NH I

No. 787.141.. Patented April 11, 1905.

."l.": UNITED STATES PATENT @EETQE. I llUlVAlil .\I. hAItBIiR, ()FS'IUNIXH'IOX, COXNIIC'IIUU'I ASHIHNUII It) B.

CU'FIhICIIIJ A: SONS COMPANY, OF NICIV YUhK, N. V.. A (.()I I(.)I\.-X'II( )N ()F XICIV J IIRSEY.

OFFSET MECHANISM FOR PRINTING-MACHINES- SPECIFICATION forming part ofLetters Patent No. 787,141, dated April 11, 1905.

Apnlieation fileti November 21,1904. Serial Ne. 233,654.

'Zo //'///m/- H m/ m/rcwr/r: 1 putting the shifting mechanism intooperalle it Itnown that I, I'IowAun M. Bantam, a 1 tion; Fig. XVII, aside view illustrating a citizen of the United States, and a residentofmodification of the shifting mechanism; Fig. Stonington, in the countyof New London and XVIII, a front view corresponding with Fig. 5 State oftonnecticnt, have invented a new and XVII.

useful Improvement in Offset Mechanism for 1t) designates the framing ofthe machine, Irintirig-Machines. of which the follmvingis (.:ontainingthe journal-box II for the shaft a specilication. 12 of thei1npression-evlinder II}, which may 'lhis invention relates to provisionfor the either have its peripheral portiondivided and [O shifting of thetympan or tympans upon the separated into a unmher of arcs ll equal tosurface or surfaces of the impression-eylinthe nmnher ofimpression-faces and correder of a printing-inachine to which it or theysponding tympans If) that may he desired or is or are attached: and itconsists in the novel may he constructed with only one impressionmeansillustrated by theaccompanyingdraw- 5 face and provided with acorresponding sinl5 ings, and hereinafter descrihed and claimed, gletympan. In the example represented t for automatically producing andcontrolling I there are four impression-faces II: and correthe shiftingmovements \vherehy certain im spending tympans 15. For each tympanpoi-taut advantages hereinafter explained are i there is represented asprovided within the ohtained. cylinder a set of four tympan-rollers, of20 Figure I. in the accompanying drawings, is l which two, ll) IT, aretympan-carrying rollf a side view of the cylinder and such other ers andtwo, IS 19, are feed rollers. 'lhe parts of a printing-machine as arenecessary rollers It are the supply or let-olf rollers, to theillustration of my invention and are I from which the tympans are taltento the im visihle from the outside of the machine, the pression-facesll, and those 17 are the wind- 25 cylinder having four tympans and asmany ing or take-up rollers, onto which the smut- )JLj sets of rollerstherefor. Fig. II is a correted portions of the tympans are taken from lsponding elevation with some of the parts I the said faces. The severalcarrying-rollers omitted to expose others to view; Fig. III, a g andfeed-rollers, which are hest shown in Fig. sideview of a cam to hehereinaftei'descrihed. I XIV, are journaled in hearings in plates 25,

30 Fig. IV is an elevation corresponding with 1 secured hy bolts 25* onthe heads of the cyl- Fig. I. hut taken transversely thereto and l inderl5 Fig. XIII represents one of these showingpartof the framinginsection.Figs. plates, of which there is one for each set of V, VI. VII, VIII,IX, and X are views of rollers at each end of the cylinder. The saidcertain details, which will he hereinafter explates may he considered asparts of the cyl- 35 plained, Figs. V to IX heing on a larger scale 1inder-hemls.

than Figs. I, II, III, IV; Fig. XI, a vertical The feeda'ollers It It)and carrying-rollers section taken parallel with Figs. I and II in l ITderive their movements at the proper in- 8 the line XI XI of Fig. IV asviewed from tervals of time fol-shifting the tympans from the right:Fig. XI' a view corresponding; reciprocating toothed racks 21), one foreach 40 with Fig. XI of some details which are partly tympan. 'lheseraclts in all the ligures of the hidden in said ligure: Figs. XII andXIII, drawingsinwhichthey appear, exceptin Figs. detail views to hehereinafter explained; XVII and XVIII, which will he hereinafter Fig.XIV, a transverse section of the im separately descrihed, are of curvedform and pressioncylinder and the rollers contained constructed on thearcs of sectors 20* and may 45 therein for carrying and feeding thetympan; he termed toothed sectors. The said sec- Fig. XV, a diagram ofthe train of gearing tors are pivoted, as shown in Fig. XI, by forshifting one of the tympans. Fig. XVI pivots 2t to the plates on one ofthe heads 9 is a side view of the tripping mechanism for l of thecylinder on different sides of its shaft,

and by their swinging or reciprocating to-andfro motion on these pivotsthey operate the several trains of gearing through which the severalrollers are set in motion, these reciprocating movements being effectedat the proper determined times through rollers 22, which are pivoted tothem and which run inside of one, 23, and outside of another, 24, of twostationary cams, which are formed eccentrically to the cylinder on aplate 47, bolted to the journal-box 11 inside of the side framing bybolts 47*, the entry of the said rollers between the said cams at theproper times being produced and controlled by a swinging curved switch26, which is pivoted to the stationary cam-plate 47 by a fixed pivot 27and operated, as hereinafter described, by means of a toggle 28 29,which connects it with a short rock-shaft 30, fitted to a bearing in theside framing 10. The curvature of the inner face of this switch soconforms to the inner curvature of the cam 23 that it may form acontinuation thereof.

The gearing between the toothed sectors and the feeding and take-uprollers is partly shown in Figs. I, II, IV, and XI; but the entire trainfor one of the tympans is shown separately in Fig. XV. Each sectormeshes for the purpose of driving its respective rollers with acorresponding pinion 31, which turns loosely on a fixed stud 32, Figs.XI, XII, XV, secured in the plate 25, and there is attached to saidpinion a larger gear 33, which meshes with a pinion 34, fast on thefeed-roller 19, and so drives the said roller, which, being geared bygears 36, Fig. XIV, inside of the cylinder with the other feedroller,18, drives the latter. The said roller 19 also carries outside of thecylinder a gear 37, which meshes with a gear 38, provided outside of thecylinder on one of the journals of the take-up roller 17, and so drivesthe lat ter. This journal is represented as constituted by a socket 39,(shown in axial section in Fig. VI and in cross-section in Fig. VII,)which has one end of the roller fitted into it, as shown in Fig. VI,with a square, so that both turn together. The said journal has fastupon it a ratchet-wheel 46, which is engaged by a pawl 57, pivoted tothe plate 25, as shown in Fig. VII, the section of which is taken in theline VII VII of Fig. VI, the said ratchet-wheel and pawl serving to holdthe take-up roller against the tension of the tympan and retain on thesaid roller the portion of the tympan taken up thereon.

The supply or let-ofi' roller 16 does not require to be and therefore isnot represented as geared with or driven by the toothed sector, but isrepresented as intended to be turned for unwinding the tympan from it bythe draft of the tympan itself when said roller is liberated, as will behereinafter described, by the tripping of a locking-pawl 41, Figs. XI,Xl' This pawl, except while the shifting of the tympan is taking place,is engaged with a ratchet-wheel 42 on the journal of said roller. Thisjournal, like that above described for the take-up roller, isrepresented in partly-sectional detail views, Figs. VIII and IX, asconstituted by a socket 43, to which the roller is fitted with a square,so as to turn with it. In order to maintain the tension of the tympan,and yet obviate the danger of its being torn by the sudden stoppage ofthe rotation of the supplyroller when its locking-pawl 41 comes intooperation after shifting, the ratchetwheel is fitted loosely to thejournal and permitted to turn a little way thereon by making the keyway60, which receives the key 61 for attaching it to the journal, widerthan the key, as will be understood by reference to Fig. IX. Thisturning movement is controlled bya coilspring 40, which surrounds theouter portion of thejournal, one end of said spring being fastened tothe ratchet-wheel by a pin 42' and the other end being fastened to thejournal by pass ing through a slot 43*, cut across the end of thelatter, as shown in Fig. IX, and being confined in said slot by acap-plate 44, secured to the end of the journal by a screw 45, screwinginto the end of the latter. The said spring allows the locking-pawl 41to engage the ratchet-wheel and stop the free rotation of thesupply-roller before the tympan-shift is completed. Thus the finalamount of tympan required to complete the shift is obtained by theyielding of the spring, thus insuring at all times a tightly andsmoothly drawn top sheet without breaks, which might be caused bysuddenly stopping the rotation of the supplyroller.

To control the movement of the take-up roller 17 according to thediameter of the body of tympan upon it, a constantly-acting frictiondevice is applied between the journal 39 of said roller and the gear 38,through which the said roller receives motion. This device is shown inthe view Fig. VI, before referred to, and in Figs. V and VII, Fig. Vbeing a face view and Fig. VII a cross-section in the line VII VII ofFig. VI. The said device consists of a spring-actuated clamp, betweenthe two members of which the said gear is contained, as shown in Fig. V.One member of the clamp is constituted by the outer face of theratchet-wheel 46, before mentioned, which is fast to the roller-journaland on the hub of which the gear is fitted to turn independently. Theother member of said clamp is a disk 48, attached to the hub of saidratchet-wheel, so as to turn with it, by means of dowel-pins 49, fast insaid disk and entering holes in said hub. Leather washers 48* areapplied between the gear 38 and ratchetwheel 46 and disk 48. Thepressure is applied to the clamp member 48 to produce the frictionnecessary for driving the roller by means of aspring 49' (represented inFig. IV as a cruciform conc'avo-convex disk,) the said pressure beingproduced and adjusted IOC IOE

by a screw 50, which passes through thespring and screws into the end ofthe journal and the head of which bears against the spring. To securethe proper adjustment, there is fastened fixedly to the head of thescrew an elastic arm 51, furnished \vitha teat which enters one of aseries of notches in the outer face of the clamp member. The movementimparted to the gear :38 by its respective toothed rack 2') should be alittle more than sntticient to give the take-up roller the necessarymovement for shifting the tympan the distance necessary to present aclean portion on the face of the cylinder when the circumference of thebody of the tympan contained on said roller is the smallest. Then as thesaid body increases the said gear will slip more and more in its clamp,and so obviate injuriously increasing tension on the tympan andliability to tear it. The friction may be adjusted at intervals betweenthe successive shiftings of the tympan by means of the screw 50.

In order that the sectors 20* should act d uring their respectivemovements in one direction only on the trains of gearing hereinbeforedescribed to produce the operations of the feed-rollers and take-uproller for shifting the tympans, the first gear 31 of each train, whichturns loosely on its stud 32, has the second gear fitted to its hub, asshown in the section Fig. XII, to turn thereon, and the connectionbetween the gears, by which 31 drives i tconsists of a ratchet-wheeloi,keyed to the hub 3i, and a pawl 55, attached to so that in the returnmovements of the racks 2t) there is no movement of the feed and take-uprollers. the latter rollers being locked by their respective pawls STand ratchet wheels to.

It has been hereinbefore mentioned that the movements of the sectors 20*on their pivots 21 to produce the operations of the severaltympan-rollers is produced at the proper times by rollers 22 on theseveral sectors running inside of one, 23. and outside of the other. 2%,of the two stationary cams under thedirectionof the swingingswitch 26.This switch at all times but when the shift is to be made is locked. aswillbe presentlydescribed, in the position shown in dotted outline inFig. X1, in which it is inoperative and allows the rollers 22 on thesectors 20* to pass outside of and clear of the cam 23, where they areinoperative, the sectors being then all held in the position relativelyto the cylinder and to their gears '31. in which the uppermost of saidsectors is represented in Figs. II and XI. This position of the sectorsis maintained in part by the locking pawl I1 locking the ratchet-wheel42 on the let-off rollers and in part by a strong coil-spring (see Fig.X) around the hub of the sector, one end of said spring being fastenedto the sector and the other end to the plate 25. The locking of theswitch 26 in the inoperative position described is effected partly bymeans of a leverarln on a rock-shaft (33, working in a bearing in astand (ii on the top of the side framing the said arm having in its enda notch 65, 7

which receives, as shown in dotted outline in Fig. XI, the end of a toeat on the rock-shaft 30. This engagement of the toe and notch, with thetoggle 2b 29, bent as shown in Fig. XVI and in dotted outline in Fig.XI, is retained partly by a spring (5T, Figs. II and IV, applied betweenan arm 68 on the rock-shaft 63 and an abutment 69 on the. stand 6%. andpartly by a pushing-spring To, applied between an abutment TT on thestand (Si and an arm TT' on the rock-shaft 31), the said spring 6Texerting a constant tendency to press the lever-arm 62 toward the toeand the spring To acting to force the toe to upward into the notch (35.Thisdisengagementleaves the toggle free to be acted upon by the springTo, which straightens it, and so throws the switch 26 into the positionshown in full outline in Fig. X1, in which it connects with the cam 23.\Vhen the proper time for the shift arrives, the lever-arm ($2 is thrownout of engagement from the toe 66 through the agency of a tripping-armT0 on the rock-shaft 63, which is acted upon, as shown in Fig. XVI, bythe inner end of a tappet T1, carried by a spurearTZ, which is fitted toturn on a fixed stud 43 on the framing and which meshes with and derivesconstant rotary motion from a gear Ti with a different number of teethand which is fast on the cvlimler-shaft and carries a tappet T5. Thetappet TI is fitted to slide radially toward and from the center of itsgear T2 and has applied to it a coilspring by which it is pressedoutward to a position in which during the rotation of its gear T2 itpasses by the trirming-lever arm TO without moving it until the timearrives for the shift, when the said tappet is pushed inward far enoughto strike said arm by means of the fixed tappet T5 on the gear Ti. whichthen arrives opposite to its outer end. The said gears T2 T3 and theirtappets and their action upon the tripping-lever to start the shiftingmechanism are such as are described in United States Letters Patent No.M51637, and therefore need only very brief description here. It has beenjust stated that the said gears have different numbers of teeth.Suppose, for example, that TI has one hundred and thirty and that T2 hasone hundred and twenty-nine teeth, it being desired to shift the tympanduring every one hundred and thirtieth revolution of the cylinder. Everytime the gear TI makes a rev olution the gear T2 lacks one tooth of thefull revolution, so that during one hundred and thirty revolutions ofthe gear TI the gear T2 will make only one hundred and twenty ninerevolutions. 'lherefore in every one hun- .drcd and thirtieth revolutionof the said gear 7 4 the two tappets come together and the tappet 71pushes out the tripping-lever arm, and so disengages the lever-arm 62and toe 66, leaving the toggle 28 29 free to be straightened by thepressure of the spring 76, and thereby to push the switch 26 into theoperative position, (shown in full outline in Fig. X1 and dotted in Fig.11,) in which it forms a prolongation of the cam 23.

For the purpose of throwing out the switch 26 into the inoperativeposition shown in dotted outline inFig. XI there is carried by theylinder a cam 90. (Represented in Fig. 11 as bolted to thecylinder-driving gear 91 and shown detached in Fig. III.) This cam inthe next revolution of the cylinder after the shift of the tympansstrikes an arm 92, which is fast on the rock-shaft 30, and so moves thesaid arm toward the center of the cylinder and produces the flexure ofthe toggle 28 29, by which the switch is thrown out, at the same timebringing the toe 66 into the engagement with the notch of the lever-arm62, by which the switch is so locked out, its position being then suchthat as the sectors are carried round by the cylinder in the positionsrelatively thereto, in which the two upper sectors are shown in Fig. XI,their rollers 22 will pass by it and outside of the cam 23 without anymovement of the sectors on their pivots 21 being produced.

It has been hereinbefore mentioned that except during the time-of makingthe shift of a tympan its supply-roller 16 is locked by the engagementwith its ratchet-wheel 42 of its locking-pawl 41. The pawls a1 arepivoted, as shown in Fig. XI, to the cylinder-head plates 25 by pivots79 and each provided with a backwardly-projecting heel 80, which at theproper times for starting the shift is acted upon by means of a stud 81,projecting from the inner face of its respective sector, to throw thepawl out of engagement, the engagement being at other times retained bya spring 82, applied between the said pawl-and an abutment 83 on thecylinder-head. To provide for retaining this disengagement during theshift, the pawls are each provided on one side with a projection 8 1,which engages, as shown in Fig. XI and also in the detail view Fig. Xl'in a notch in one arm of an elbow-shaped detent 85, which is pivoted tothe plate 25 by a pivot 86, and this latter engagement is caused to beretained by a ooil-spring85', applied in a well-known manner between thesaid detent and its pivot until another stud 87 on the sector strikesthe end of a screw 88 in the other arm of the detent 85 just before thestoppage of the shifting movement, and so releases the projection 8 1 ofthe pawl and allows the latter to be reengaged with the ratchet-wheel 12by the pressure of its spring 82. The adjustment of the screw 88 toproject more or less from the elbow provides for the action of the stud87 to reengage the stop-pawl with its ratchet-wheel in proper time forthe stoppage of the supply-roller 16.

All parts of the shifting mechanism and their several and respectiveoperations having now been explained. I will briefly describe theirsuccessive operations in makinga shift, first supposing the switch 26 tohave just been thrown into the operative position shown in full outlinein Fig. X1 and the roller 22 of that sector 20"", which is, in the upperrighthand portion of that figu re, having just been brought to theswitch by the rotation of the cylinder in the direction of the arrowshown upon the latter. The continued rotation of the cylinder carriesthe said roller 22 along the inner face of the switch 26 and along theinner face of the cam 23, and by its so running along the sector iscaused to turn on its pivot in the opposite direction to that in whichthe cylinder itself turns. During the latter part of this movement ofthe sector the unlocking of the ratchet-wheel of the supply-roller isproduced by the action of the stud 81 of the sector upon the heel of thelocking-pawl 11. The latter now being engaged by the detent is held outof engagement with the ratchet-wheel 42 on the supply-rollcr until theshift is completed, as hereinafter described. During the whole of themovement of the sector in the direction described no movement of thetympan takes place, the gear 31 then turning on the stud 32 withoutturning the gear 33, because the ratchet-wheel 54 slips past the pawl55. The further continued rotation of the cylinder carries the roller tothe cam 24:, and by the passing of said rollcr over this cam themovement of the sector is reversed, thus producing the turning of thegear 33 in the proper direction to produce, through the gears 34 37 38,the turning of the take-up roller 17 and the shifting of the tympan. Asthis movement of the sector is nearly completed the stud 87 thereoncomes into operation on the point of the screw 88 of the detent 85,and so releases the locking-pawl 11 of the supply-roller and allows itto come into operation on the ratchet-wheel on said roller.

During a single revolutionof the cylinder the operation hereinabovedescribed with reference to one tympan shifting sector and the mechanismthrough which it acts on its respective tympan takes place with respectto all four tympans, one after another, and during the next revolutionof the cylinder the cam 90 on the cylinder-gear 91 comes into operationon the arm 92 of the rock-shaft 30, and so throws out the switch 26 toits inoperative position, where it remains until, after the determinednumber of revolutions of the cylinder, the tappets 71 75 again cometogether for repeating the shifting of each of the tympans, asdescribed, during a single revolution of the cylinder.

An important feature of the example which I have selected forillustration of my invention and have herein particularly described isthat the radii of the sectors which produce the shifting movement isless than the radius of the impression-cylinder to which they areapplied. This makes in the space between the circumterence ot' the c\linder and its shat't room for as many of these sectors as 1 In themodil'ication of my invention shown in Figs. XYlI and XYIH thereciprocating 1 toothed rack 2o instead of being in the form of an arcand constructed directly on a sector consists of a straight bar pivotedat one end to a swinging piece 20 in the form of a bellcranl lever.which is pivoted to the cylinder by a pivot ll in the same way in whichthe toothed sector id is pivoted thereto. The said straight raclt id isconlined in engagement with the gear 31 by means of two rollers ill in a\'()l\'t [)5. which is litted to thestud 32 so as to be capable of thenec 'ary slight oscillation thereon. The lever 20 resembles the sector20*, except that the curved rack 20. integral with the latter sector,omitted and the pivoted straight rack substituted, and the said lever isprovided, lilte the sector, with a similar cam-roller 2'2 and a similarstud SI for said rack to said rollers, and means for prod ucing themovement of said rack by the revolution of the cylinder.

2. The combination with the impressioncylinder of a printing-machineadapted to receive a plurality ol tympans and provided with acorresponding number of sets of tympanrollers. oi a correspomling numberof reciprocating raclts carried by the cylinderhead at ditlerent pointsthereon, gearing between each of said racks and its respective set oftympan-rollers through which movement is transmitted from the rack tothe rollers, and a means common to all ol said raclts for pro ducingtheir movements by the revolution of the cylinder.

3. The combination with the impressioncylinder of a printing-machineadapted to receive a plurality ol tympansand provided with acorresponding number of sets of tympanrollers, ot' a correspondingnumber of reciprocating raclts carried by the cylinderhead at differentpoints, gearing between each of said raclts and its respective setoltympan-rollers through which movement is transmitted from the raclt tothe rollers, and a stationary cam for producing the movements of theseveral raclts in succession by and during one revolution of thecylinder.

4c. The combination with the impression 1 cylinder of a printing-machineand a tympantripping the locking-pawl ot' the tympansupthe shift anddisengaged as soon as the shift iscompleted. anism the tympan travels atthe same speed throughout the entire operation and is subjected to asevere shoclt at the engagement of the clutch. l y the mechanism hereinde scribed. operated by a cam-actuated raclt, the tympan is started andstopped so gradually \Yith the clutclroperated mechj winding roller insaid cylinder, of a recipro eating rack carried by said cylinder,andgearing between said rack and roller through which movement istransmitted directly from said rack to said roller during the movementof the rack in one direction only.

The combination with the impressioncylinder of a printing-machine andtympanrollers applied within said cylinder, of a re ciprocating rackcarried by said cylinder for producing the movement of said rollers anda spring applied to said rack for holding it in an inoperative position.

(3. The combination with the impressioncylinder of a printing-machincand tympan supply and take-up rollers in said cylinder, of

that all shoclt is eliminated, and owing to the very gradual movementimparted to it at the I cylinder of a plil'itillgfilltlcll1110 and atympancommencement and end of the shift it may be operated at a higherrate of speed without danger of breakage. always leavii'ig a smoothtightly-drawn top sheet to receive the offset. \Yhat i claim as myinvention l. The combination with the impressioncylinder of aprinting-n'iachine and tympanrollers applied within said cylinder, of areciprocating rack carried by said cylinder, gearing between said ltlCh'and rollers through which movement is transmitted directly from areciprocating rack carried by said cylinder and gearing between saidraclt and the takeup roller for turning the latter, a locking deviceapplied to the supply-roller, and a projection on said raclt lordisengaging said device and liberating the latter roller.

T. The combination with the impressionwinding roller in said cylinder,of a reciproeating l't\(3l( carried by said cylinder, gearing betweensaid rack and winding-roller includ- 1 ing a gear on said roller throughwhich motion is transmitted from said rack to said roller, and aspring-controllerl friction device between said gear and said roller.

e. The combination with the impressioncylinder of a printing-machinc andtympan supply and talte-up rollers in said cylinder, of

a reciprocating rack carried by said cylinder and gearing between saidrack and the takeup roller for turning the latter, a ratchetwheel on thesupply-roller and a locking-pawl wheel on the supply-roller and alocking-pawl on the cylinder-head for engaging with said ratchet-wheelto lock the said roller and a spring between said ratchet-wheel and thesupply-roller.

10. The combination with the impressioncylinder of a printing-machineand tympanrollers applied within said cylinder, of a reciprocating rackcarried by said cylinder,gear

ing between said rack and rollers through which movement is transmittedfrom said rack to said rollers, stationary cams through which by therevolution of the cylinder the movement of the rack in oppositedirections is produced, a switch forproducing the engagement of the rackwith said cams and automatic means for producing said engagement atpredetermined times for shifting the tympan.

11. The combination with the impressioncylinder of a printing-machineand tympanrollers applied within said cylinder, of a sector pivoted tosaid cylinder, gearing between said sector and rollers through whichmovement is transmitted directly from said sector to said rollers, andmeans for producing the movement of said sector by the revolution of thecylinder.

12. The combination with the impressioncylinder of a printingmachine andtympanrollers applied within said cylinder, of a sector pivoted to thecylinder and of less radius than the cylinder, gearing between saidsector and rollers through which movement is transmitted from saidsector to said rollers and means for producing the movement of saidsector by the revolution of the cylinder.

13. The combination with the impressioncylinder of a printing-machineadapted to receive a plurality of tympans and provided with acorresponding number of sets of tympan-rollers, of a correspondingnumber of sectors pivoted to the cylinder-head at different points,gearing between each sector and its respective set of tympan-rollersthrough which movement is transmitted from the sector to the rollers,and a means common to all of said sectors for producing their movementsby the 5 revolution of the cylinder.

14:. The combination with the impressioncylinder of a printing-machineadapted to receive a plurality of tympans and provided with acorresponding number of sets of tympan-rollers, of a correspondingnumber of sectors pivoted to the cylinder-head at ditferent points,gearing between each sector and its respective set of tympan-rollersthrough which movement is transmitted from the sector to the rollers,and a stationary cam for producing the movements of the several sectorsin succession by and during one revolution of the cylinder.

15. The combination with the impressioncylinder of a printing-machineand a tympanwinding roller in said cylinder, of aswinging sector pivotedto said cylinder, gearing between said sector and roller for directlyproducing the movement of the roller by the swinging of the sector, saidgearing comprising means which transmit the so-produced movement to theroller during the movement of the sector in one direction only.

16. The combination with the impressioncylinder of a printing-machineand tympanrollers applied within said cylinder, of a sector pivoted tosaid cylinder for producing the movement of the said rollers and aspring applied to said sector for holding it in an inoperative position.

1'7. The combination with the impressioncylinder of a printing-machineand tympan supply and take-up rollers in said cylinder, of a sectorpivoted to said cylinder and gearing between said sector and the take-uproller for turning the latter, a locking device applied to thesupply-roller, and a projection on said sector for disengaging saiddevice and liberating the latter roller.

18. The combination with the impressioncylinder of a p rinting-machineand a tympanwinding roller in said cylinder, of a toothed sector pivotedto said cylinder, gearing between said sector and winding-rollerincluding a gear on said roller through which motion is transmitted fromsaid sector to said roller, and a spring-controlled friction devicebetween said gear and said roller.

19. The combination with the impressioncylinder of a printing-machineand tympan supply and take-up rollers in said cylinder, of

a sector pivoted to said cylinder and gearing between said sector andthe take-up roller for turning the latter, a ratchet-wheel on thesupply-roller and a locking-pawl on the cylinderhead for engaging withsaid ratchet-wheel to lock the said roller, a projection on the sectorfor disengaging the pawl from the ratchetwheel, a detent on thecylinder-head for bolding the pawl disengaged, and a projection on thesector for producing the disengagement of the detent from thelocking-pawl.

20. The combination with the impressioncylinder of a printing-machineand tympan supply and take-up rollers in said cylinder, of a sectorpivoted to said cylinder and gearing hetween said sector and the take-uproller for turning the latter. a ratchet-wheel on the sup ply-roller anda locking-pawl on the cylinderhead for engaging with said ratchet-wheelto lock the said roller and a spring between said ratchet-whcel and thesupplyroller.

21, The combination with the impressioncylinder of a printing-machineand tympanrollers applied within said cylinder, of a sector pivoted tosaid cylinder, gearing between said sector and rollers through whichmovement is transmitted from said sector to said rollers. stationarycams through which by the revolution of the cylinder the movement of thesector in opposite directions is produced, a switch for producing theengagement of the sector with said cams and automatic means forproducing said engagement at predetermined times for shifting thetympan.

22. The combination with the impressioncylinder of a priMing-machine andtympanrollers applied within said cylinder, of a sector pivoted to saidcylinder, gearingbetween said sector and rollers through which movementis transmitted from said sector to said rollers, stationary cams throughwhich by revolution of the cylinder the movement of the sector inopposite directions is produced, a switch for producing the engagementof the sector with said cams, a locking device for holding said switchin an inoperative position, l a spring for holding said locking devicein l operation, a spring for throwing said switch into its operativeposition and automatic 1 means for unlocking said locking device atpredetermined times for shifting the tympan and permitting the latterspring to throw the switch into operation.

23. The comhination with the impressioncylinder of a printing-machineand tymganrollers applied within said cylinder, of a sector 2O pivotedto said cylinder, gearing between said sector and rollers through whichmovement is transmitted from said sector to said rollers, stationarycams '23, A, through which by the revolution of the cylinder themovement of the sector in opposite directions is produced, a switch 26for producing the engagement of the sector with said cams, a lockingdevice consisting of two rock-shafts 31), a too 66 and a lever-arm 62 onsaid rock-sha t'ts, a toggle 28, 22), between said rockshat't 30 and theswitch for throwing the switch into and out of its operative position, aspring T6 applied to said rock-shaft 31) for straightening saitl toggleand throwing the switch into operative position, a spring (37 applied tothe rock-shaft 63 for throwing said locking device into operation, arotary tappet T1 deriving motion from the cylinder, and a lever-arm Tl)on the rock-shaft 63 on which said tappet acts to throw said lockingdevice out of operation.

In testimony that I claim the foregoing as my invention I have signed myname, in presence of two witnesses, this 15th day of November, A. L).190%.

HO\VA RI) BARBER.

\Yitncsses:

A. R. S'IILLMAN, (i. BURDICK.

